Probing the nodal structures of heavy electron superconductors by means of specific heat measurements in magnetic fields

T. Sakakibara*, J. Custers, K. Yano, A. Yamada, T. Tayama, Y. Aoki, H. Sato, H. Sugawara, H. Amitsuka, M. Yokoyama

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

2 被引用数 (Scopus)

抄録

Measurements of the angle-resolved specific heat C (H, θ) have been performed on PrOs4 Sb12 and URu2 Si2 in order to examine their superconducting gap structures. In the filled skutterudite PrOs4 Sb12, a clear fourfold angular dependence is observed with H rotated in the (1 0 0) planes, whose field variation suggests gap minima along [1 0 0] directions. Interestingly, a reversed angular oscillation of C (H, θ) has been observed in the normal state above Hc 2 which continues to grow as the high-field antiferroquadrupole phase is approached. In URu2 Si2, C (H, θ) with H rotated around the tetragonal c-axis suggests that the nodal structure has rotational symmetry. Comparison between the C (H) data for a- and c-axes indicates the existence of point nodes along the [0 0 1] direction.

本文言語英語
ページ(範囲)990-993
ページ数4
ジャーナルPhysica B: Condensed Matter
403
5-9
DOI
出版ステータス出版済み - 2008/04/01

ASJC Scopus 主題領域

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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